What is it used for?

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This server-side scripting language can generate dynamic page content, create files on a server, open, write, read, close, or delete files.

PHP is database friendly, so you can add, modify or delete data within a database effortlessly.

In addition to this, PHP can also collect data from your forms, support cookies, perform data encryption, and control user access.

According to a report by W3Techs , 79.2% of all websites on the Internet use PHP as their server-side programming language as of March 19, 2021.

Some of the popular websites that use PHP are WordPress.com, Facebook.com, Wikipedia.org, Zoom.us, Microsoft.com, Canva.com, Salesforce.com, and many more.

Applications
Apps and Websites: Modern websites and apps must offer a higher level of customization, a highly interactive and user-friendly user interface, support seamless integration and enable secure online transactions, while offering fast performance.
PHP uses a three-tier architecture that runs on your server, database system, and browser in a linear fashion to meet this demand.

Graphic Design and Image Processing: PHP is reliable for handling text content and graphic design and image processing. It supports integration with many libraries such as ImageMagick, GD library, Imagine and more PHP-based applications.
It allows users to rotate, resize, crop, add watermarks, create bosnia and herzegovina phone number data thumbnails and extract images in various formats like PNG, GIF, JPEG, WBMP and XPM.

Web CMS: PHP extends support to multiple databases and interacts with different services via protocols including IMAP, POP3, HTTP, COM, SNMP, etc.
For this reason, it is common to create web content management systems such as WordPress, Moodle, Drupal, Joomla, etc.

GUI Based Applications: You can create graphical user interface (GUI) based applications using PHP-GTK 2 and ZZEE PHP GUI which allow PHP scripting and compiling your code into an .exe file , which can run standalone.
Data Representation: Using tools like Image_Graph with PHP, you can create different data representations like tables, charts, and more. It is useful in e-commerce websites and applications that leverage data representations in various forms.
To create flash elements: You can create flash elements like gradients, shapes, bitmaps, buttons, texts, morphs, animations, actions, email forms, login forms, etc. using PHP based open source libraries (e.g. Ming).
To build eCommerce applications: Building an eCommerce application is easy using PHP-based frameworks like CodeIgniter. It is useful for businesses of all scales, from startups to large enterprises. PHP-based eCommerce platforms are Magento, PrestaShop, OpenCart, and many others.
That's all about PHP.